Brake reliner



Patented Sept. 28, 1926.

UNITED STATES'PATENT OFFICE.

LAMES B. WALKER, OFOBANGE, MASSACHUSETTS, ASSIGNOR TO ,ATHOL' MACHINE& FOUNDRY CO., OF AT1-IOL, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

BRAKE Rrimlvnn.v

Application filedr November This invention relates to apparatus forrelining brake, transmission and like bands, wherein the lining is positioned within the band, while the band and lining are held under tension on a relatively rotatable anvil against which the fastening rivets may be upset.

My present invention involves certain iin provements upon the rotary reliner disclosed in my prior application, Serial No. 6423, filed February 2, 1925, which in turn was an improvement on the liner shown in Letters Patent to Hunt, No. 1,411,358, dated August 24, 1922, to which reference is made as showing the development of the device involved herein.

While satisfactory for bands of standard width, the device of my prior application lacked capacity for adjustment to accommodate bands of varying width. Moreover, in the device of my prior application, the anvil had a t-endency to rotate on its axis under the hammer blows which drove home tho fas,- tening rivets and unless the band and lining exactly fitted withiny the space between the peripheral flanges of the anvil. there was a possibility that the band and lining would not be evenly registered with each other throughouttheir length or breadth.

My present invention avoids these disadvantages while at the same time possessing a capacity for adjustment to accommodate varying widths of bands and linings. According to it, the rotary anvil is axially adjustable with reference to a stationary circular head of the base member, the parts having a telescopic fit one within the other. This permits the effective distance 'between the peripheral lianges of the head and anvil respectively to be vari-ed according toV the width of the band and liningto be riveted. The axial adjustment of the anvil is made against the tension of a coil spring, the normal tendency of which is to urge the Aanvil towards the stationary head. This makes certain that the band and lining will be continuously and uniformly pressed towards the peripheral flange of the circular head so that the lining and band will be accurately centered relative to each other tli1'ou;gl.iout their entire extent. The anvil is circular and corresponds to the curvature of the brake drum to which thelining and band are tc be fitted, so that when the lining and band are vapplied to the anvil and the band is 13, 1925. serial No. 68,742.

tightened by means of a special screw nut the lining will not overlap the edge of; the

band so as to bind on the edge ot the drum when applied.

Vith the lining thus clamped within the band both peripherally and circumferentially, and with the. tension of the coil spring acting to prevent accidental rotation of the anvil as the rivets are hammered home, all possibility that the lining will become loose in the band or loose between the rivets is avoided as is the possibility of the lining extending beyond the edge of the band. The lining cannot, therefore,'buckle within the band and cannot chatter.

ln addition to these advantages, the time for relining a band is materially shortened and the labor correspondingly reduced as compared withpresent practice.

The construction and operation 0f my device, together with a selected embodiment thereof which well illustrates the principles involved and is itself a form found satisfactory in use, is described and shown in the accompanyingspecification and drawings, and the characteristic features of novelty are particularly pointed out in the appended claims. Throughout the specilication and drawings, like reference characters are correspondingly applied, and in the drawings:

Fig. 1 is a side elevation of a relining device in accordance with my 'present invention. 1

Fig. 2 is an edge view thereof.

.Fig 3 is a plan view. Y

Fig. 4 a vertical section on the line 4 4Y ot Fig. 1.

F 5 is a detailed sectional view of my improved screw nut for tensioning the band circumferentially.

I have indicated at 1 a stationary base member which is provided with a flat supporting foot 2, adapted to be rigidly fastened to a bench or support and at 3 withV an enlarged circular head having a continuous peripheral flange 4 and an axially disposed bearing 5.

lSet through the bearing -5 and held therein by a lock nut is a bolt 7 which is proxided between its ends with a shoulder 8 fastening rivets 16 are driven theret adapted to abutC the adjacent face of said bearing. Loosely mounted on the bolt 7 to rotate thereabout as an axis is a circular anvil 9 which is formed to present a continuous bearing surface 10 which is disposed towards and telescopic within the flange of the stationary head, and constituting a truly circular supporting surface for the lining L and band B to be relined.

rlhe anvil is formed with an angular peripheral flange 11 surrounding said circular bearing surface 10 and with a bearing 12 for the bolt 7. @oiled about the projecting end of said bolt, vbetween the head 13 the cof and said bearing 12 is a spring 14, the normal tendency of which is to press the rotary anvil towards the stationary head.

Both the head and the anvil are perforated through their web portions as indicated at 15 to lighten the weight, the holes 15 in the rotary anvil having the additional function of serving as finger' openings through which the lingers may be introduced to grasp the Vanvil and draw it axially along the bolt away from the stationary hea-d. rlhis permits various widths of bands and linings to be laid upon the circular supporting surface 10 of the anvil between thel peripheral flanges of the head and anvil respectively.

As soon as the anvil is released, the coil spring 14 urges it towards the stationary head, thereby clamping the band and lining frictionally between said flanges and holding it against relative movement when the hrough and upset against said supporting surface 10. In use, the lining is first laid upon the supporting surface 1() and conforms to the circular shape thereof. rlhe band is next applied over the lining and its ends drawn together by means of a special screw member which l have designed to fit the ears 17 of the band.

This screw nut is detailed in Fig. 5 and consists of a female portion or nut 18 which is interiorly threaded to receive the eXteriorly threaded screw 19. Both the nut 18 and screw 19 are provided with enlarged circular heads 20' which may be milled or otherwise roughcned, if desired, to facilitate their adjustment and which are adapted to be drawn towards each other and against the outer faces of the ears of the band when the band is tensioned. My special screw nut is simply laid through 'the slotted ears and upon rotation of the screw member thereof, by means of a screw driver the ends of the band are drawn towards each other until the band is put under sufficient tension. This clamps the lining smoothly within the band against the supporting face of the anvil so that all tendency of the lining to buckle is eliminated.

The continuous pressure against the edges of the band andv lining is enerted by the flanges of the anvil and head so that the lining cannot project beyond the edge of the band and constitute an exposed edge which will bind on the edge of the adjoining drum when the band is replaced in the car. The lining and band are `new ready to be riveted together. rl`his may be done in the usual manner, lout for convenience of use l supply with my device a special punch 20, the active end of which is concaved to conform to the curvature of the rivet head.

This punch is normally carried in a vertically disposed socket 22, formed in'the base ineinber 1 just above the bearing l thereof, and it may he removed and held in the hand as an ordinary setti-ng punch in driving home the rivets, or under some cn.'- cnmstances may be left in its soclret and itself used as an anvil against which the rivets of a band and lining held in the 'hands may be upset.

'li/That I therefore claim and desire to secure by Letters Patent is:

1. ln a brake band liner, a head having -a circular flange, a circular anvil rotatably mounted therein and movable axially thereof, and resilient means for urging said ai-- vil into said head.

2'. ln a brake band liner, a head having a circular flange, a circular anvil rotatably mounted therein and movable axially thereof, a flange on the outer edge of said anvil, resilient means for urging said anvil into said head to clamp the band and to friction the anvil.

3. ln a bralre band liner, a head having a circular recess and a central bearing axially thereof, a circular anvil rotatably mounted on said bearing and slidable thereon to fit within said recess and having Van outer flange o pposed to said recess edge, and a spring disposed to urge said ai- 'l within said recess.

l. ln a brake band liner, a head having a circular recess and a headed cenralb ing axially thereof, a circular anvil ro ably mounted ol said bearing and slidable thereon to fit within said recess and havi- \A an outer flange opposed to said recess ce..L and a spring on said hearing disposed hetween its head andV the anvil to urge said anvil within said recess. y

ln testimony whereof l aii; my signature. Y

JriltES B. VYALKER.

rie 

